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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e99dc8dcc9edd7934e269f064f52ae6ed824fbe2b3217875fa41154c54e84aa' 
  AND token = 'ijVRxg0HyeozPWboIQfL2OYgRFUsC+R6rUng7p0k7pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}